Create a two-dimensional table

A two-dimensional table is used to combine or reclassify two raster maps or columns which use a class or ID domain. The domains of these two maps or columns are the two input domains for the two-dimensional table.

The two maps or columns can be reclassified to another class, ID or value domain. This is firstly determined by the output domain of the two-dimensional table, and secondly by the class names, IDs or values which you need to assign to each field in the two-dimensional table.

This dialog box appears:

when from the File menu of the Main window, you choose the Create 2 Dimensional Table command, or
when you double-click the New 2DimTbl item in the Operation-list.

Dialog box options:

Table name:	Type a new name for the two-dimensional table.
Description:	Type a description for the two-dimensional table. The description of the table appears in the title bar when the table is displayed. Further, the description is visible on the status bar of the Main window when moving the mouse pointer over the table in the Catalog.
Primary Domain:	Select an existing class or ID domain, i.e. the domain of the first map or column which you wish to reclassify. The classes or IDs of this domain will appear as rows in the table.
Secondary Domain:	Select an existing class or ID domain, i.e. the domain of second map or column which you wish to reclassify. The classes or IDs of this domain will appear as columns in the table.
Domain:	Select or create a domain for the fields in the table. The output domain selected here and the values of the fields in the two-dimensional table, which you have to fill out yourself, will determine the values in the output map when applying the two-dimensional table.
Value Range:	If you you selected a value domain for the fields in the two-dimensional table, type the minimum and maximum value that you want to be able to enter in the fields of the two-dimensional table.
Precision:	If you selected a value domain for the fields in the two-dimensional table, type a value to define the number of decimals that you can use in the fields of the two-dimensional table.

After clicking the OK button, the two-dimensional table appears in a table window.

In the table window, you will see rows which represent the first input domain, and columns which represent the second input domain. In the two-dimensional table, you have to define a value, class name or ID for each possible combination of input classes or IDs.

When you finished editing a two-dimensional table, you have to apply it on the input maps by typing an expression on the command line of the Main window. For more information, see Map calculation : classifying two maps according to a two-dimensional table.